If you don't hear any difference then don't worry about it.
The rest is right too but its this last bit that matters. Most of the advice against coiling is based on large cords coiled many times which can get hot maybe even fire hazard hot. But you just can't coil a fat 5 ft power cord enough for that.
What you can do though is create a field powerful enough to smear the signal- and not just in the interconnects but in the power cords themselves as well. This is not anything you will ever hear as noise, per se. Its doubtful you will hear anything at all. The only way to know if its there is to carefully and correctly route all cables maintaining as much spacing around them as you can. They should also be up off the floor and away from walls and anything else- especially other cables. When they must come close crossing at right angles is better than parallel. Of course we can't always do this but to the extent its possible that's the idea.
Then after all this tweaking you give everything an hour or so to settle down, after all that bending it'll need it. Then listen and it will be like a thin veil has been removed. That veil was the noise you couldn't hear.
If you don't hear it don't worry, you can always put it back. Lol!